DC chopping and boosting circuit

Abstract

The invention discloses a DC chopping and boosting circuit, which comprises three channels arranged in parallel, wherein each channel comprises an inductor and a diode; each channel is connected with a load resistor in series to form a loop, and the on-off of each channel is controlled through a switching tube; and the load resistor is connected with a capacitor in parallel. The DC chopping and boosting circuit breaks through the restriction of power size and frequency of the switching tubes, solves the difficulty of heat dissipation since the three channels are parallelly connected and dissipate heat in a distributed manner, further reduces ripple current of total input and output since each channel provides 1 / 3 power and the average current of each channel is 1 / 3 of the total current, reduces designed capacitance of the capacitor accordingly, prolongs the service life of the whole device, and reduces size and weight.

Description

technical field [0001] The invention relates to a telephone structure, in particular to a DC chopper boost circuit. Background technique [0002] The common step-up chopper circuit and the switching tube are as follows: figure 1 with figure 2 As shown, the single-channel working mode is adopted. When the switch tube K is closed, the inductor L stores electric energy, and when the switch tube K is turned off, the inductor L charges the output capacitor C through the diode D, and boosts the output. This circuit has the following disadvantages: [0003] 1. The current all passes through the inductor and diode, and the peak current is extremely large, that is, the input and output ripple current is very large, resulting in a large electrical stress on the output filter capacitor; [0004] 2. In order to be able to output the required rated power, the volume and weight of the inductor is generally very large (due to the limitation of IGBT / MOSFET power devices and diodes, in ...

AI Technical Summary

Problems solved by technology

[0003] 1. The current all passes through the inductor and diode, and the peak current is extremely large, that is, the input and output ripple current is very large, resulting in a large electrical stress on the output filter capacitor;

[0004] 2. In order to be able to output the required rated power, the volume and weight of the inductor is generally very large (due to the limitation of IGBT / MOSFET power devices and diodes, in order to increase the frequency of the switching tube, the purpose of reducing the size cannot be achieved);

[0005] 3. The heat generated by the loss is concentrated in the same place, which is not conducive to heat dissipation

Images